Tetrapod for drills



(Hommel.) A. E W MEISSNER.

TETRAPOD FOR DRILLS.

No. 573,608. 'Patented 1360.22, 1896.

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ADOLF EMIL WALDEMAR MEISSNER, OF CIIARLOTTENBURG, GERMANY, AS-

SIGNOR TO THE SIEMENS d: IIALSKE ELECTRIC COMPANY OF AMERICA, j OF CHICAGO, ILLINOIS.

TETRAPYOD FOR DRILLS.

SPECIFICATION forming part of Letters Patent No. 573,608, dated December 22, 1896.

Application filed May 2, 1896. Serial No. 589,972. (No model.) Patented in Germany October 3, 1895, No. 85,864.

To @ZZ whom it 77ml/ concern: screws b' b2. The drill is attached to the Be it known that I, ADOLF EMIL WALDE- clamp b by means of a cone thereon fitting MAR MEIssNER, a subject of the Emperor of into the conical opening b3, provided in the Germany, residing at Charlottenburg, Gerdrill-clamp b, with its axis at right angles to 5 many, have invented new and useful Improvethe shaft, and is secured to the clamp in any 5 5 ments in Tetrapods for Drills, (Case No. 70,) position by means of a set-screw. Thus the of which the following is a specification, and drill has movement in one plane upon the for which Letters Patent have been granted cone, iitting in opening b3 as aXis, and Inovein Germany, No. 85,864, dated October 3,1895. ment in another plane at right angles thereto Io My invention relates to an improved tetraupon shaft a as axis. 6o

pod for drills. Four legs CZ cl cl2 cl3 are mounted rotatably The object of my invention is to provide a upon the shaft a, two at each end, by means support for drills of sufficient strength and of the collars e e' e2 e3, secured, respectively, solidity for drills of the heavy percussion at the tops of the legs. The said collars are 15 type, permitting a wide range of drill adjustfree to revolve upon the shaft, but are pro- 65 ment after the device has been set in position vided with means mentioned below for rigfor work. Heretofore the tripod has been in idly securing them in any position of revolugeneral use for this purpose, but it has not tion upon the said shaft. proven adaptable to drills capable of striking A ring or shoulder f f is rigidly mounted on 2o heavy blows, because of insufficient strength either side of the drill-clamp b upon the shaft 7o and solidity. A drill mounted upon a tripod a, being secured to the said shaft by pins or has also only a limited range of adjustment, keys f2 f3, inserted in holes provided' in the' and the tripod must be quite frequently rings and shaft, respectively. The abutting moved in order that the varying conditions faces of the rings ff and the collars c e e2 e3 2 5 of the work may be met. These difficulties are of the alternate form of solid and hollow 75 the device of my present application remefrustums of cones of the same angle and didies, permitting a drill of great power to be ameter. A cap or washer h 7L is provided at satisfactorily operated in any direction after each end of the shaft, whose shoulders bear the tetrapod has been set. upon the outermost collar. A set-screw g g 3o My device consists of a drill clamp or colat each end bears against the respective cap, -8o lar and four legs mounted upon a heavy horioperating in a tapped hole provided in the zontal shaft on which they are free to revolve, solid end of shaft a.. When it is desired to means being provided for rigidly securing all lock the legs of the tetrapod in position, these the parts in any position of rotation in which set-screws are tightened, pressing the caps 35 they may be placed. h 7L' against the adjoining collars e2 e3, which 85 In the accompanying dra-wings, Figure l in turn bear upon the next collars e e' and is a perspective view of the device as it apthese upon the rigid rings f f. Thus by pears when set in position for work. Fig. 2 means of the concentric solid and hollow is a detailed view of the upper portion of the frustums of cones upon their abutting faces 4o tetrapod, partially in section. the legs are locked in position.` 9o

Like letters refer to like parts throughout In practice it has been found that the frusthe figures. turns should be of cones having an acute an- Referring to the drawings, the shaft a is gle of about thirty degrees in order to secure preferably of tubular construction with solid the best results in locking the parts rigidly 45 ends and provided with thick walls to resist in position with but little strain upon the de- 95 the necessarily-heavy strains that are put vice and its parts and for readily releasing upon it. At the center of this shaft is axially the same when desired. mounted drill clamp orcollar b, free to revolve The legs of the tetrapod are mounted upon upon the shaft, but may be rigidly secured. the shaft by means of the collars at an ob- 5o thereto in any position of rotation by settuse inner angle with the said shaft in order roo to secure as broad a base as possible when the legs are extended. lVhen set in position, the legs are as heavily weighted as may be desired by adjustable Weights 7a k k2 7c3, &c., placed upon the legs above the shoulders provided therefor. Amore advantageous disposition of the weights can thus be made than when a tripod is used.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

l. In a support for drills, thecombination with the shaft a, of a drill-clamp I) mounted upon said shaft, means for securing the same in any position of rotation thereon7 collars e e e2 e3 rotatably mounted in pairs upon the said shaft on either side of the drill-clamp, four `legs secured to the said collars and adapted to be independently spread to positions of wide divergence forming a quadrilateral base for said drill-support, and independent means for locking each pair of legs and collars in any position of adjustment, substantially as described. y

2. In a support for drills, the combination with a horizontal shaft a of a drill-clamp b rotatably mounted upon said shaft, means for securing the same in any position of rotation upon the said shaft, shoulders ff' provided upon the said shaft, one on each side of the drill-clamp, four collars e e' e2 c3 rotatably mounted two on each end of the shaft, engaging oblique walls or faces provided upon the said collars, and shoulders in the shape of alternate solid and hollow frustums of Ycones of the same angle and diameter, four legs cl d (Pds secured to the said collars, a cap or Washer 7L hf at each end of the said shaft adapted to bear upon the outer face of the adjoining collar, a set-screw g g provided at each end of the shaft adapted to engage the cap thereon and lock the collars in any position of rotation upon the said shaft; substantially as described.

3. In a support for drills, the combination with a drill-clamp rotatably mounted upon a horizontal shaft, of means for securing the same upon the said shaft in any position of rotation thereon, shoulders provided upon the shaft upon each side of the said clamp, two collars axially mounted upon each end of the shaft beyond the said shoulders, said shoulders and collars being provided with engaging oblique walls in the shape of alternate solid and hollow frustums of cones of the same angle and diameter, four legs secured respectively to the four rotatably-mounted collars, and adapted to be independently spread to positions of wider and wider divergence from one another as the said collars are rotated to form a quadrilateral base of increasing dimensions, and means for locking the parts in any position of rotation upon the said shaft; substantially as described.

In testimony whereof I affix my signature in the presence of two witnesses.

ADOLF EMIL WALDEMAR MEISSNE'R. lVitnesses:

PAUL RAEDIGER, J ULIUs ZINGLER. 

